{
    "action": "tool_call",
    "reasoning": "I need to get a complete count of distinct values for all categorical columns across all tables. I'll query the meta.columns table which contains the complete metadata including approx_distinct_count for all columns.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT table_name, column_name, phys_type, approx_distinct_count FROM meta.columns WHERE rough_kind = 'categorical' OR semantic_role = 'classifier' ORDER BY table_name, approx_distinct_count DESC",
        "purpose": "Get complete list of all categorical columns with their distinct value counts",
        "source": "raw"
    }
}